Electric-arc lamp.



PATENTED MAY 26, 1808.

N0.ss9,1es.

. W. s. WEEDON.

ELECTRIC ARC LAMP.

APPLIUATION FILED SEPT. 21, 1904. RENEWED 001122, 1906 inventor Wi I Ham S. Weedon DTttg Laterdl openings 5 an" @FFICE.

WILLIAM S. WEEDON, OF WOODBURY, NEW JERSEY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

nLEc'rRrc-Ano LAMP.

- Specification of Letters Patent;

Patented May 26, 1908."

Original application filed May 20, 1904, Serial No. 208323. Divided and application filed September 21, 1904:. Serial No. 225,296. Renewed October 22, 1906. Serial No. 30,0%1.

T 0 all' whom; it may concern:

Be it known that I, WILLIAM S. WEEDON, a citizen of the United States, residing at Woodb'ury, county of Gloucester, State of New Jersey, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a specification.

My present invention relates more particularly to that electrodes employed insure a flaming or luminous arc, though all of the features of my invention are not limited to use with such electrodes.

The object of my present invention is an arrangement whereby a suitable draft through the lamp can be obtained.

The various features of novelty which characterize my invention are pointed out with particularity in the claims annexed to and formin a part of this specification.- For a better understanding of my invention, however, reference may be made to the accompanying description and drawings in which I to are lam s,

ave illustrated and described one embodiment of iny invention.

Of the drawings, Figure 1 is an elevation ,of an arc,lamp equipped with my invention with parts broken away and in section, and Fig. is a perspective view showing a portion of theair screen. V

Referring to the drawings, 1 represents the upper cap or top member. of the lamp roper. A r isk-shaped platform 2 is connecte to the cap 1 by a tubular member 3. A tubular member 4 in line with the tubular member 3 extends a short distance above the cap 11 in the wall of the member Mat its upper end areshielded by a hood 6- carried at the upper end of the member 4.

ings, may be provided for engaging the hood member 6 to support the lamp. The members 3 and 4 may be integral with each other but are preferably separable and may be secured to the cap member 1 by a threaded connection. Similarly the platform 2 may be supported frqm the lower end of the mem her 3 by a threaded connection.

A tubular member 7 in line and in open communication with the members 3 and dis secured to but insulated from the under side of the platform 2. Bowed members 8 pivotally secured to opposite sides of the tubular member 7 have clamped between their type in which t e bular member 7.

Suitable provisions, not shown in the drawends the ends of an arc-sha I ed bar 9 which forms the positive electro e of the lamp.

The bar 9 is formed of some material such as wrought copper which is a good conductor of v i heat and electricity and is not readily oxidined at the temperature to which. it is sub jected. Slots 10 are formed in opposite sides of the member 7 at its lower end to admit the passage through the member? of the bar 9, A projection 8, from one ofthe bowed, mem: bers is connected by linksor bars .11 to a U-. shaped armature .12- which with its cooperating solenoid coils 13 is located between the cap 1 and the platform 2.

A tubular member 15 passing through an aperture formed for the purpose in the platform 2 has secured to its lower end an arm 16 which carries a socket 17 at its free end,

inwhich thenegative electrode 18 of the lamp is held in line with the axis of the tu The electrode 18 isformed of or contains some material, such for in.- stance as magnetite, titanium. oxid orthcir mixturesjtitanium calbid or the like, which in consuming gives a flaming or luminous thought it necessary to illusism located between the hood 1 an the plat- I form 2, by means of which the movements'of the electrodes 9 and 18, necessary to the proper o eration of the lamp, are obtained as this mec ianism forms no part of my present invention. its operation are illustrated and described in detail in my application for patent .on are lamps, Serial No. 208,923, filed May 20,1?04; of which the present ap Jlication is a division. Novel features disclose in the present appli Moreover, this mechanism andcation, but not claimed therein, are claimed in the parent application referred .to.

A casing 25 which may be formed of sheet metal or the like incloses the lam mechanism located between the cap 1 and the plat form2, the upper end of the casing being se-Z cured to the cap 1 in any suitable manner as by means of screws 26. The lower end of the casing closely embraces the platform 2. Aper-tures 27 are formed in the lower end of the casing above the platform 2, through which air may enter the casing to ventilate the lamp mechanism. of the casing at its upper end, suite is s aces being left between the casing and the T be heated air asses out 'tect the apertures 27.

2 sssnee for that ui pose. A hood or waterguard 28 surroun the lower end of the casing to pro- An annular hood or member 29 secured to the casing below the hood-28 sup orts a suitable transparent or translucent g obe 30 in any suitable manner as by screws31.

The globe 30 which surrounds the lamp mechanism located below the platform 2 is formed with a large opening at its lower end. A sheet metal annular member 32 is secured to the lower end of the globe in any suitable manner as by screws 33 which. engage the globe abovethe out-turned end portion 34. A cylindrical member 35 having its lower end flared outward somewhat as shown, fits .nugly in the central opening of the annular member with its axis in line with the axis of member 7. The member 35 may be secured to the annular member 32 by soldering or it fnay be detachably connected to the member 3 2. A wire netting 36 of comparatively fine mesh is secured to and extends across the u'pper end of the cylindrical member 35. A somewhat similar netting 37 extends transversely across the cylindrical member 35 about midway between its ends. This netting may be supported by annular members 38 and 39 as shown. 1

It will be observed that the lower netting 37 is about in a lane with the lower end of the annular mem er 32, while the upper net ting 36 is considerably abovethis plane. As a result of this construction, when the lamp is located out of doors or elsewhere where it is subject to more or less violent gusts of wind, the provisions of the cylindrical member 35 and the two screens or nettings separated b some distance, as shown, prevent any so den inrush of air into the interior of the globe. This "is an important advantage, as' with .lamps of this character it is desirable for their proper operation to admit a sufficient amount of air in the casing to insure that the natural draft created by the heat of the arc will carry the are products up through the tubular members 7, 3 and 4 to the apertures outside air. 5 0

5 through which they are discharged into the This draft tends materially to steady the arc which extends between'the electrodes. Ajvariation in the amount of the draft, particularly a sudden variation, produces a disturbing influence upon the operation of the lam By the use of the construction shown isturbances produced by gusts of the outside air are reduced to a 'minimum.

It may be desirable to admit a small amount of air at-the junction between the annular member and the lower end of the globe and at the junction between the upper end of the globe and the hood. In many cases, however, it may be desirable to make these joints substantially air-tight, all of the air necessary to produce proper draft being then admitted throu h the cvlindrical mem- Letters Patent of the United States, is,

i. In an arc lamp, a draft tube, a pair of electrodes so arranged that the arc between them is in line with the axis of the draft tube and immediateiy below its lower end, a globe inclosing the are having an opening formed in it in line with and below the draft tube, a cylindrical member in line with the draft tube, and one or more air screens extending transversely to said member.

2. in share lamp, a draft tube, a pair of electrodes arranged to produce an arc extending in. line with said draft tube, a globe surrounding said arc, an aperture in said'globe in line with said arc and said tube, and a screen located in said aperture which allows the passage of air sufficient for the operation of the lamp but which prevents sudden gusts of air from entering said globe.

. 3. in an arc lamp, an inclosing globe surrounding the arc, a. passage leading therefrom through which the are products are car ried by natural draft, an aperture in the globe tln'ough winch the air necessary for the proper operation of the lamp may pass, and a comparatively fine wire screen extending across such aperture to prevent disturbing air currents from being sent rip-within the globe by gusts of air surrounding the globe.

4. In an arc lam? a draft tube, means for establishing an elec o are jacent one end or said tube, a globe surrounding said tube,

' an aperture in said globe substantially in line with said draft tube, and means for preventing sudden fluctuat ons in the amount of air passing through said aperture.

5. in an arc lamp, a draft tube, a parrotelectrodes so arran ed that the are between them is in line with the draft tube, a globe surrounding the said are, an aperture in the globe below the said arc and in line-with said draft tube, an upwardly-extending cylinder surrounding said opening, and a screen closing said cylinder at a point above said opening. 6. in an arc lamp, a draft tube, a pair of electro es arr "-e are in ine with the I sub a cylinder surrounded by said opening and projecting inward toward said tube, and a screen for closing said cylinder.

7. In an arc lamp, electrodes, a globe surrounding said electrodes and having an open-' 7 ing a central opening and a cylinder w ich is central opening and a surrounded by said opening and projects into the interior of the globe,'and a screen which closes said cylinder. 2o

10.413 11 arc lamp, a draft tube, a globe surrounding the lower end of the draft tribe, an open-ended cylinder arranged in line with the draft tube and, having one end projecting into the. globe and the other end projecting outside of the globe, and apair of electrodes arranged so asto form an arcbetween and in line with said draft tube andsaid cylind'e'ni' In witness whereof, I'have hereunto-set 1; my hand this tenth day of September, 1904;] 30

' WILLIAM S. WEEDON.

Witnesses:

PAUL I. ML'RRILL, WILLIAM T. BAXTER. 

